could you post a screenshot of the VNR bitmap?
if the lines go straight down, good. if they are going down, then some are offset... this could mean bad columns.
Samsung like using xor tricks, so this is possible like Arvika said.
for the CE issue, can you get a datasheet?
is the dump total size bigger than drive capacity a little?
each bank should be 4Gb with a page size of 9216. How many chips on the SSD, and are the chips 32GB ea?
some chips of this ID are DDR, though not sure about the BGA ones. Your chip has a "Y" in the position that would denote the tech, but the decoder doesn't say what that is, I am guessing Toggle Mode. This page
http://www.usbdev.ru/databases/memory_type/ shows that some other chips with the Y in that position are DDR.
maybe if you can get a datasheet of any other nand of same package, and also 8ce + 4RB you can see how this works, and may give you some insight.
it is nearly 2am so sorry if this is a hodge-podgey type help!